Geodesic
Discrete-group analysis of ordinary differential equations
Differencialʹnye uravneniâ, Tome 25 (1989) no. 3, pp. 379-387 
V. F. Zaitsev. Discrete-group analysis of ordinary differential equations. Differencialʹnye uravneniâ, Tome 25 (1989) no. 3, pp. 379-387. http://geodesic.mathdoc.fr/item/DE_1989_25_3_a1/
@article{DE_1989_25_3_a1,
     author = {V. F. Zaitsev},
     title = {Discrete-group analysis of ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {379--387},
     year = {1989},
     volume = {25},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_3_a1/}
}
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